July 13, 2010

MRCP 1 Question 13

What specific part of the eye is mainly responsible for acute vision ?
a) zonnule of Zinn
b) limbus
c) optic disc
d) macula
e) fovea

The correct answer is E


The fovea lies slightly below and to one side of the optic disk. It is found in the centre of a shallow depression or pit (the macula).

Only cones are present at the fovea, which is an area approximately 0.2 mm in diameter: all other parts of the retina including blood vessels are pushed aside.

The cones here have individual connections with the bipolar and ganglion cells, hence the fovea gives us our most sensitive and acute vision.

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